Urea-formaldehyde resin additive, urea-formaldehyde resin containing the same and preparation method thereof

Abstract

The invention provides an additive with urea formaldehyde, a preparation method and a urea formaldehyde resin adhesive. The additive is provided by the invention. The raw material of the additive is comprised of the dispersion medium, the dried egg white of the degreased bean and the complexing agent, the weight ratio of the raw material is: 70-80 of dispersion medium, 20-35 of dried egg white ofthe degreased bean, 1-3 of complexing agent, the complexing agent is consisted of the aluminium sulphate and the zirconium carbonate with the weight ratio of 0.4-2.4:1. The additive provided by the invention contains dried egg white of the degreased bean, and then both the bond strength of the prepared veneer is increased and the formaldehyde emission of the preparing artificial slabs is effective decreased when adding the additive into the urea formaldehyde.

Description

technical field [0001] The invention relates to an additive for an adhesive, an adhesive based on an organic polymer compound containing the additive and a preparation method thereof, in particular to an additive for a urea-formaldehyde resin for wood-based panels, a urea-formaldehyde resin containing the additive and its preparation method. Background technique [0002] Over the past 30 years, my country's wood industry has developed rapidly. In 2006, the total output of wood-based panels was 74.28 million cubic meters, including 27.29 million cubic meters of plywood and 11.55 million cubic meters of blockboard. The total output of wood-based panels, plywood, and furniture all rank first in the world. [0003] Since formaldehyde-based adhesives are generally used in the production of wood-based panels, especially urea-formaldehyde resin adhesives, there is a problem of formaldehyde release in wood-based panels and their products (furniture, wooden floors, interior wood de...

AI Technical Summary

Problems solved by technology

For example, 1) Although the use of a low molar ratio modified urea-formaldehyde resin adhesive can effectively reduce the formaldehyde emission of wood-based panel products, the bonding strength of the product is often reduced, which cannot meet the requirements; the curing time is prolonged and the production efficiency is reduced; 2) the use of other Environmentally friendly adhesives, such as isocyanate adhesives, often lead to a substantial increase in the production cost of wood-based panels, which is difficult for enterprises and users to accept; 3) Adding formaldehyde scavenger to the urea-formaldehyde resin adhesive for wood-based panels can effectively reduce free formaldehyde in wood-based panels. release amount, but it often reduces the bonding strength of wood-based panels at the same time; at the same time, the price of general formaldehyde capture agents is often much higher than that of urea-formaldehyde resin adhesives, and its addition increases product costs and reduces product competitiveness. FC-5 formaldehyde scavenger sold at 50,000 yuan / ton. If 1%-2% is added to the glue, the cost of urea-formaldehyde resin per ton will increase by 500-1,000 yuan; 4) Post-treatment of wood-based panels, For example, the invention patent application with the publication number CN1526528 discloses a manufacturing process of E1 / E0 grade environment-friendly wood-based panels, using the ammonia vacuum method, and the utility model patent with the publication number CN2394770 discloses a method for reducing formaldehyde release from wood-based panels. A large amount of processing equipment, but the investment in post-processing equipment is often large